Make the enum QuadratureTypes::Enum a proper enum class

Summary

Since c++11 we have enum classes to solve the problem of scoped names for enums. This MR replaces the old workaround with a proper enum class for QuadratureType. This will allow in future c++ standards to use QuadratureTypes inside of switch case statements and makes the code more readable.

Discussion

In order to use enum class types as integers, e.g. as index in a vector, it must be explicitly converted into the underlying integer type. No implicit conversion happens. Once the quadrature cache is replaced with a proper map, this cast is not longer necessary. See !174.

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• 2ae401d3 - Explicitly cast the enum class type to int

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• 112055e1 - Use static_cast for enum to int conversion

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changed the description

added 9 commits

• 112055e1...8a765857 - 8 commits from branch master
• bbd5e0c5 - Make the enum QuadratureTypes::Enum a proper enum class

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This is unfortunately a breaking change. While it would be a more modern c++ way, it does not bring any other benefits. Therefore, I will close this MR.

closed